top_actor

def get_top_actor():
    top_actor = (Actor.objects.prefetch_related('starring_actor_movies')
                 .annotate(num_movies=Count('starring_actor_movies'),
                           average_rating=Avg('starring_actor_movies__rating'))
                 .order_by('-num_movies', 'full_name')).first()

    if not top_actor or top_actor.num_movies == 0:
        return ''

    all_movies = ', '.join(m.title for m in top_actor.starring_actor_movies.all())

    return (f"Top Actor: {top_actor.full_name}, starring in movies: {all_movies}, "
            f"movies average rating: {top_actor.average_rating:.1f}")